4G Grader
A heavy duty Four Deck Grader and Grain Grading Machine engineered to sort seed, grain and peanuts into uniform size grades in a single pass, so buyers receive consistent lots and processors lose less good crop to downgraded product.
35+
Years of experience
700+
Customers served
Global
Export support
Machine Overview
Four Deck Grader Overview
Swastik Technology’s Four Deck Grader is a precision sizing machine that passes seed, grain and peanuts over four stacked, vibrating screen decks, each fitted with a different perforation size, so that product leaves the machine in separate, uniform size fractions. Also supplied as a Grain Grading Machine, it is built as a Multi Deck Grader for processors who need several grades from one feed rather than a single cut. Known in the trade as the 4G Grader, the range is specified as a Grain Grader by flour and rice mills, and as an Industrial Seed Grader by seed companies that sell lots by size. The wider Agricultural Grading Machine family also serves groundnut processors, sesame exporters and pulse packers. Every unit is built as Seed Processing Equipment that slots straight into a cleaning line, sized to the crop, the grades required and the throughput the plant runs.
Equipment
What Is a Four Deck Grader?
A Four Deck Grader is a sizing machine in which four screens are stacked one above the other inside a vibrating frame. Product is fed onto the top deck, and as the frame oscillates, each screen lets material smaller than its perforations fall through while carrying larger pieces along to a separate outlet. Because the screen openings get progressively finer from top to bottom, the machine splits one mixed feed into several size grades in a single pass, which is far faster and more consistent than grading by hand or running the same lot through a single-screen machine repeatedly.
It works on size, not density, and in that respect it differs from a Destoner Machine. The sizing function is the same one carried out by a Screen Grader, with four decks giving the extra grades that many mills, seed companies and exporters now require. Placed after the cleaning stage and before packing, this Grain Grading Machine is where mixed crop becomes saleable, uniform product.
How It Works
How Does a Grain Grading Machine Work?
1
Feeding
Pre-cleaned grain, seed or peanuts are spread evenly across the top deck through a feed hopper.
2
Vibration
A motor-driven eccentric drive shakes the deck frame so material travels steadily across each screen.
3
Screening
Each deck passes material smaller than its openings downward and carries larger pieces forward.
4
Size Separation
Perforation sizes get finer deck by deck, so the feed divides into distinct size fractions.
5
Grade Discharge
Each size grade leaves through its own outlet into bags, bins or the next conveyor.
Machine Advantages
Key Features of Our Four Deck Grader
A Four Deck Grader frame with four stacked screens that split one feed into several size grades in a single pass.
Screen perforations selected to match the crop and the grades the buyer specifies.
Replaceable screen sets for switching between crops and size ranges.
Robust frame and drive built for continuous, heavy-duty operation.
Even feed distribution across the deck width for consistent separation.
Separate outlets for every grade, keeping size fractions from mixing.
Low grain breakage thanks to controlled vibration and gentle product flow.
Compact footprint relative to the throughput and number of grades delivered.
Easy access to screens for cleaning and changeover between lots.
Mild steel or food-grade contact parts depending on the crop.
Uses
Applications of the Grain Grading Machine
Flour Mills & Rice Mills
Sorts wheat, rice and paddy by size ahead of milling and packing.
Groundnut & Peanut Processing
Works as a Peanut Grader and Peanut Grading Machine, sorting kernels and in-shell pods into size grades for sale.
Peanut Export Packing
Acts as a Peanut Size Grader that meets the size-count specifications overseas buyers set.
Seed Companies & Multiplication Farms
Works as a Seed Grader and Seed Grading Machine that gives uniform, saleable seed lots.
Sesame & Pulse Cleaning Lines
Removes undersize and oversize product to lift the final grade of the lot.
Oil Mills & Crushing Plants
Sizes seed ahead of crushing to keep extraction consistent.
Processing
Crops & Materials Graded
✓
Wheat
✓
Rice and paddy
✓
Maize
✓
Pulses
✓
Peanuts and groundnut kernels
✓
Sesame seed
✓
Sunflower seed
✓
Mustard seed
Business Benefits
Benefits of Using a Four Deck Grader
Produces several uniform size grades from one feed in a single pass.
A Grain Grading Machine lifts the selling price by letting lots be sold to a specified size.
Meets buyer and export size specifications before container loading.
Cuts the labour of manual sorting and hand grading.
Reduces undersize and oversize product mixed into premium lots.
Improves seed uniformity, which supports even sowing and germination.
Continuous duty design suited to mill and seed plant throughput.
Low breakage compared with repeated passes through single-screen machines.
Why Swastik Technology
Why Choose Swastik
35+
Years of Manufacturing Experience
Decades of experience in designing and manufacturing industrial processing machinery.
700+
Customers Served
Machinery supplied to customers across different processing industries.
⚙
Engineering & Customization
Solutions can be designed around specific production requirements.
🌎
Export Support
Support for machinery requirements across domestic and international markets.
✓
Direct Support
Direct communication with the manufacturing and technical team.
Relevant Plants
Relevant Machines
Frequently Asked Questions
FAQs About Four Deck Grader
A Four Deck Grader sorts seed, grain and peanuts into several uniform size grades in one pass, using four stacked vibrating screens with progressively finer perforations.
Yes. Swastik Technology builds one core range and supplies it as either a Four Deck Grader or a Grain Grading Machine, with the deck size, screens and capacity chosen to match your crop and the grades you need.
No. Grading works on size, so a stone the same size as the grain passes through with it. A destoner removes stones by density, which is why most lines use both machines together.
Yes, by changing the screen set. For a plant running several crops through the year, the screens are selected to cover each crop, and the deck is cleaned down between lots.
The number of grades depends on the number of decks and the screen perforations chosen. Share your crop and target sizes with our engineers and they will confirm what a four deck configuration can deliver.
Sizing depends on crop type, required grades, throughput and the level of cleaning already done upstream. Share these details with our engineering team and they will recommend a suitable machine.
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